Hi all, I'm using apache 2.4.29 on Ubuntu 18.04. I get warning msg on my apache logs that says "Failed to acquire SSL session cache lock". Here are the logs: [ssl:warn] [pid 6667:tid 140575428806400] (22)Invalid argument: AH02026: Failed to acquire SSL session cache lock [ssl:warn] [pid 6667:tid 140575428806400] (22)Invalid argument: AH02027: Failed to release SSL session cache lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01949: Failed to release OCSP ssl-stapling lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling-refresh lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01949: Failed to release OCSP ssl-stapling lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01949: Failed to release OCSP ssl-stapling lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01949: Failed to release OCSP ssl-stapling-refresh lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH02026: Failed to acquire SSL session cache lock [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH02027: Failed to release SSL session cache lock This issue occurs after running for several days (1-3 days) but after i restart apache service there is no warning msg and then it will occur in several days again. I use http2 and ssl-stapling. When the warning message appears, my website is still online and still accessible. However, I want to know the cause of this warning message that I still don't know.
More info:Website: https://www.apkgeny.com/Server version: Apache/2.4.29 (Ubuntu) Server built: 2018-10-03T14:41:08 Server's Module Magic Number: 20120211:68 Server loaded: APR 1.6.3, APR-UTIL 1.6.1 Compiled using: APR 1.6.3, APR-UTIL 1.6.1 Architecture: 64-bit Server MPM: event threaded: yes (fixed thread count) forked: yes (variable process count) Server compiled with.... -D APR_HAS_SENDFILE -D APR_HAS_MMAP -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled) -D APR_USE_SYSVSEM_SERIALIZE -D APR_USE_PTHREAD_SERIALIZE -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT -D APR_HAS_OTHER_CHILD -D AP_HAVE_RELIABLE_PIPED_LOGS -D DYNAMIC_MODULE_LIMIT=256 -D HTTPD_ROOT="/etc/apache2" -D SUEXEC_BIN="/usr/lib/apache2/suexec" -D DEFAULT_PIDLOG="/var/run/apache2.pid" -D DEFAULT_SCOREBOARD="logs/apache_runtime_status" -D DEFAULT_ERRORLOG="logs/error_log" -D AP_TYPES_CONFIG_FILE="mime.types" -D SERVER_CONFIG_FILE="apache2.conf" Here is dump config apache2ctl -t -D DUMP_RUN_CFG :ServerRoot: "/etc/apache2" Main DocumentRoot: "/var/www/html" Main ErrorLog: "/var/log/apache2/error.log" Mutex ssl-stapling: using_defaults Mutex proxy: using_defaults Mutex ssl-cache: using_defaults Mutex default: dir="/var/run/apache2/" mechanism=default Mutex watchdog-callback: using_defaults Mutex rewrite-map: using_defaults Mutex ssl-stapling-refresh: using_defaults PidFile: "/var/run/apache2/apache2.pid" Define: DUMP_RUN_CFG User: name="www-data" id=1000 Group: name="www-data" id=1000 I'd appreciate your help. Thanks in advance.
